Buffalo lock horns inside a stadium in Do Son, Vietnam, 27 September, 2009. Do Son, a popular beach-side town three hours east of Hanoi, plays host to an annual Buffalo Fighting Festival every autumn, with water buffalo and their entourage of farmers and trainers arriving from all over the mountainous north, where they have been in isolated training for months..The bulls are led into a football stadium and lock horns, the victor eventually chasing the vanquished out of the grounds to thunderous applauds from thousands of spectators, most of whom are betting heavily on the fights. The buffalo - both winners and losers - are then slaughtered outside the stadium, with their prize-fighting meat fetching up to $50 per kilogram for their owners.